The Kiwang ("go king", like the Chinese Qiwang) is a former Korean title that was replaced some years ago with the international LG Cup.
For the majority of its 20 terms it was won by Cho Hun-hyeon.
A complete list of winners can be found
on the MindZine site
or
on Jan van der Steen's site.
(These lists do not quite agree. I think the error is in Jan van der Steen's.)